Malicious PDF — malware analysis report

Static analysis result for SHA-256 a168f3ac1988f873…

MALICIOUS

PDF

69.5 KB Created: 2020-11-10 12:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20bdae39131d7402f524a3ffafb769d1 SHA-1: d1d27ff4cbc32b419dbbd0a5f4eca95d64ae5bf5 SHA-256: a168f3ac1988f873aafe07da51c0c89a7510ea80a964c9ede55f1c6d1c76733a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external links points towards a phishing or content distribution attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/aws?keyword=hawaiian+telcom+tv+guide
    • https://cdn-cms.f-static.net/uploads/4379726/normal_5f8a6b04d7020.pdf
    • https://fuwozubasuzej.weebly.com/uploads/1/3/4/4/134473550/eddd3cb0394.pdf
    • https://cdn-cms.f-static.net/uploads/4470385/normal_5fa592452485c.pdf
    • https://cdn-cms.f-static.net/uploads/4388413/normal_5f95df6d6d0b7.pdf
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5f9734c44e042.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zalomi/glider_paper_airplane_how_to_make.pdf
    • https://uploads.strikinglycdn.com/files/361fbee1-c2d0-4186-8aae-72554c3f81ee/94616666047.pdf
    • https://uploads.strikinglycdn.com/files/d7313969-a013-4d6f-a7ab-3590491e07dd/22671790518.pdf
    • https://uploads.strikinglycdn.com/files/68ad7f1c-5efd-46f1-bc08-6949b6d0f571/11800858923.pdf
    • https://s3.amazonaws.com/nagev/kazam_weeride_co_pilot_bike_trailer.pdf
    • https://s3.amazonaws.com/tixedujegibex/3744564423.pdf
    • https://s3.amazonaws.com/fosalizuzu/2nd_grade_math_worksheets_free.pdf
    • https://uploads.strikinglycdn.com/files/92d08db6-7f94-4860-ba54-398300daaa73/sabusodapezexudowofexiwap.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d494.bin
388747cfd50f29aeaa02799db694f7ceb8c6df35a453e6c9ab4841850694d03b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 5100 bytes
font_01_sfnt_off0000e5f4.bin
79b0164bd991f7b291f1bb689e622140dc775d5c161c5ca1086cfd88113e086c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 10476 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.